 Outer Port Shelter, is situated at the mouth of the harbour.The boundary of Port Shelter has different definition according to different sources.Publication of the U.S. Hydrographic Office, had stated the western shores of Keui Island (now known as Kau Sai Chau) and Jin Island, as well as eastern and north-east shores of the mainland area (now HKUST, Tseung Kwan O New Town and Clear Water Bay Peninsula), were the boundaries of Port Shelter.